I train at home and still rarely train shirtless.
When I'm on the bench, either my skin sticks and it's tough to get the shoulder blades to retract, or I'm too sweaty and can't get an decent arch.
Squatting, the knurling takes off most of my skin.
Anything with a belt chafes like hell.
No fucking way I'm doing a yoke walk without a shirt.
There are a few times where it works out, but for the most part, if it's hot, I'll just wear a tank top.